set_multihop · Mullvad MCP: Risk & Policy

WHAT IT DOES

What set_multihop does on Mullvad

AI agents use set_multihop to create or update resources in Mullvad — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mullvad environment.

WHY IT NEEDS A POLICY

Why set_multihop needs a policy

The tool modifies VPN configuration (multihop routing) rather than merely reading state or executing arbitrary operations. This is a reversible write operation—the setting can be changed back. Severity is medium because misconfiguration could disrupt user connectivity or privacy posture, but no financial or destructive consequences.

From the tool's definition Tool name 'set_multihop' indicates configuration modification of Mullvad VPN multihop setting. Sibling tools include 'connect', 'disconnect', 'get_settings', implying this server performs write operations on VPN state and settings.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_multihop Rate-limited

set_multihop stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_multihop": {
      "limits": [
        {
          "counter": "set_multihop_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mullvad, so you can run agents against it safely.

FAQ

Questions about set_multihop

What does the set_multihop tool do? +

set_multihop. It is categorised as a Write tool in the Mullvad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_multihop? +

Register the Mullvad MCP server in PolicyLayer and add a rule for set_multihop: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mullvad. Nothing to install.

What risk level is set_multihop? +

set_multihop is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_multihop? +

Yes. Add a rate_limit block to the set_multihop rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block set_multihop completely? +

Set action: deny in the PolicyLayer policy for set_multihop. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides set_multihop? +

set_multihop is provided by the Mullvad MCP server (oresam-xyz/mullvad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.